initial commit, add slides on permissive licenses
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Tobias Olausson
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README.md
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README.md
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# Slides for foss-north podcast
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This repo contains source files for the slides we use when recording the foss-north
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podcast/screencast, starting with the series on licenses.
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# License
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The different slides are under different licenses depending on what license the material included in
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the slides are under. This should be marked in each slide deck somehow. In general, we try to make
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the slides available as CC-BY-SA 4.0 International
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permissive/Makefile
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permissive/Makefile
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all:
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pandoc slides.md -t beamer -o permissive.pdf --slide-level=2
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ppt:
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pandoc slides.md -o permissive.pptx --slide-level=2
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clean:
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rm permissive.pdf permissive.pptx
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permissive/license-flow.png
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permissive/license-flow.png
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permissive/slides.md
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permissive/slides.md
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---
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title: Permissive Software Licenses
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subtitle: foss-north pod
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author: foss-north
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license: CC-BY-SA 3.0
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header-includes: |
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\usepackage{xcolor}
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\definecolor{fossorange}{HTML}{ffcc33}
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\setbeamercolor{background canvas}{bg=black}
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\setbeamercolor{section in head/foot}{bg=black,fg=fossorange}
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\setbeamercolor{subsection in head/foot}{bg=fossorange,fg=black}
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\setbeamercolor{normal text}{fg=fossorange}
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\setbeamercolor{block title}{fg=black,bg=fossorange}
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\setbeamercolor{titlelike}{fg=fossorange}
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\setbeamercolor{itemize item}{fg=fossorange}
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\setbeamercolor{itemize subitem}{fg=fossorange}
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\setbeamerfont{caption}{size=\tiny}
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\setbeamerfont{footnote}{size=\tiny}
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\setbeamerfont{footnote mark}{size=\tiny}
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theme: Malmoe
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aspectratio: 169
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---
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# Background
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## BSD History
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- BSD was based on Research Unix by AT&T[^1]
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- Early versions subject to AT&T license
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- Networking code first released under BSD license 1989
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- Rest of BSD rewritten to remove all AT&T code 1991
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[^1]: https://en.wikipedia.org/wiki/History_of_the_Berkeley_Software_Distribution
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## BSD History
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- AT&T sued[^AT&T]
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- Slowed development, helped Linux gain popularity[^LinuxBSD]
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- BSD 4.4 released afterwards
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- FreeBSD, OpenBSD, NetBSD etc
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[^AT&T]: https://en.wikipedia.org/wiki/USL_v._BSDi
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[^LinuxBSD]: https://gondwanaland.com/meta/history/interview.html
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## MIT history
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- MIT, IBM and DEC (now HP) collaboration
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- X window system
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- Kerberos
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- Wanted to make it public domain - IBM didn't like that[^IBM]
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- New license created with MIT lawyers[^MITLawyer]
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- X license and MIT license not the same but very similar
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[^IBM]: https://opensource.com/article/19/4/history-mit-license
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[^MITLawyer]: https://twitter.com/JimGettys/status/1112782559937789953
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## Why permissive?
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- Allows proprietary changes
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- Usually allows relicensing as proprietary
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- Easier to understand
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- Highly compatible (allow further restrictions)
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{ width=50% }
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# BSD licenses and friends
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## Original BSD license
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- 4 clauses
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- Source distribution requires copyright notice
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- Binary distribution requires copyright notice in documentation
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- Advertisement material requires acknowledgement of original authors
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- May not use original authors as promotion
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- Incompatible with GPL - imposes extra restrictions
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## New BSD license
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- 3 clauses
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- Advertisement clause removed
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- Used by CMake, tcpdump, XMonad
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## Simplified BSD license
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- 2 clauses
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- Non-endorsement clause removed
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- Used by FreeBSD, OpenH264
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## Other BSD
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:::::::::::::: {.columns}
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::: {.column width="45%"}
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### Zero-clause BSD
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- Used by ToyBox
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- Busybox is GPL-licensed
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:::
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::: {.column width="45%"}
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### ISC license
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- Similar to BSD
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- OpenBSD
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:::
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::::::::::::::
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## MIT license
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- Also known as the Expat license
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- Very similar to the simplified BSD license
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- Used by .NET Core, Rails
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# Modern permissive licenses
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## Apache License 2.0
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- Can't relicense unmodified parts
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- Need to state what's been changed in changed files
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- Grants a license to any patent
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- OpenBSD doesn't like this![^BSDCopy]
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- Used by Kubernetes and PDF.js
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[^BSDCopy]: http://www.openbsd.org/policy.html
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## Other permissive licenses
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:::::: {.columns}
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::: {.column width="45%"}
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### Satirical licenses
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- WTFPL
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- Beerware
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### Permissive with reservations
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- Commons clause (controversial!)
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:::
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::: {.column width="45%"}
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### Public domain-ish
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- Unlicense
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- CC-0
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### Zlib license
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- Zlib and libpng
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- Require license notice in source distributions
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- May not be misrepresented
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:::
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::::::
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## Mozilla Public License 2.0
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- Grants patent rights, just like Apache license
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- A weak copyleft license
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- "File-level copyleft"
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- Combined works may be proprietary
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- But original MPL licensed works must be freely available
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- Explicitly compatible with the GPLs
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- Used by Firefox, Syncthing, LibreOffice
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